Metallic spiral hose.



" Aun. 714,429.

Pafented Nov'. 25, i902. E. WITZENMANN.

METALLIC SPIRAL HOSE.

(Application me@ sape. 2, 1902.)

2 Sheets-Shoot (lo Model.)

i Witnessesz Zfzz/acfz/fm/zfz, Inventor;

Abornegs (No Model.)

Witnesses `Fammi Nov. 25, |902;

E. WITZENMANN. METALLIC SPIRAL HOSE.

kApplication filed Sept. 2, 1902.)

Im] @15e/077420Z, in ve n to r,

Atkorhefgs me Nomi; ma ca. Mofaumo.. wAswmuvon. u c,

`UNITED STATES PATENT OFFICE.

EMIL WITZENMANN, OF PFORZHEIM, GERMANY.

METALLIC SPIRAL HOSE.

SE'GIFICATION forming part of Letters liateni'.` N o. 714,429, dated November 25?, 1902-. Application filed September 2, 1902. Serial No. 121.747. (No model.)

1PZ-l0 al1-ZZ whom. t may concern):V

Be it known that I, EMIL WITZE'NMANN, manufacturer, a subject of the Grand Duke of Baden, residing at 48 Holzgartenstrasse,` Pforzheim, Germany, have invented certain new anduseful Improvements in Metallic Spiral Hose, of which the following is a specication.

Metallic spiral hose provided with packedl joints is usually of substantially section, the packing material lying in the gutter or channel between two adjacent flanges.` The disadvantage attaching to such construc-l tion is that on the hose being sharply bent or subjected to great internal pressure the packing is more or less forced from its proper position.

My invention relates to an improved construction of hose, whereby this inconvenience is prevented, while the tightness ofthe joint is improved.

In the annexed drawings, Figure lis a sec-` In ordinary metallic spiral hose of the sec-4 tion shown in Fig. l the packing material a lies in the channel b, formed between the two engaging iianges c and d of two adjacent turns of the metallicstrip. Such metallic spiral hose, as alreadyremarked, has the defeet that on sharp bending of the hose orl great internal pressure, which causes longitudinal stretching of the hose and consequent narrowing of the channel b, the packing a protrudes at e. (See Fig. 2.)

The subject of my inventiony is a metallic spiral hose in which on bending or internal pressure the packing a is compressed, so insuring a tight joint, but is not caused to protrude at e' in the manner just described.

Fig. Sshows one manner in which my improved hose may be constructed. The essen- 'rection.

tial feature of the construction is that a special lip, channel, or flange f is provided to receive a second or safety packing g, which lies adjacent to the main packing, preventing the latter from protruding from its proper channel b.

It is not absolutely necessary that' my new hose is of the precise section shown in Fig. 3, since the object in view-z'. e., prevention of protrusion of the main packing aby means of auxiliary packing g--can be attained in various other manners.

Fig. 4 of the accompanying drawings shows, for example, another form of construction of my new hose, in which instead of only one auxiliary packing two such packings g g are employed, one lying to the left and the other to the right of the main packing a. This construction has the advantage over the form of hose illustrated in Fig. V3 that protrusion at e `is still more certainly prevented. This is obvious above all because the auxiliary packing g, lying to the left of the main packing a, prevents the exercise of a great pressure in the channel b of "the main packing a, so that the tendency of the latter to protrude at e under the pressure exerted in the inside of the hose is from the rst less. In many cases, however, it is diificult to completely prevent the protrusion of the main packing a at e, Fig. 2,A by means of auxiliary packing material g g--for instance, when the hose in addition to high internal pressure has also to withstand severe stretching or pull in longitudinal di- In this case not only does the internal pressure act upon the main packing af', tending to press the latter laterally out of the channel b, Fig. l, but in addition there is the pull acting externally on the hose and tending to approach the flanges c and d, Fig. l, of the hose, and so press the packing a tightly together. In some instances this force tending to stretch the hose longitudinally is so great that the packing a without any internal pressure being exerted in the hose is forced out of the channel b at the part e, Fig. 2. With a view to overcoming this inconvenience I have further modified -the construction of hose described so that the pull tending to stretch the hose in longitudinal direction can no longer be attended with the drawbacks referred to. For this purpose I IOO employ a means whereby the hose is prevented from being stretched beyond a certain extent in longitudinal direction. In other words, the main packing a, is prevented from being compressed between the anges c and d, Fig. 1, beyond a certain limit.

Fig. 5 shows one form of construction of a hose with means for thus preventing undue stretching. In this construction the metal strip forming the hose is of such section that the overlapping part d of the strip is provided with a step at 7i. If now, for instance, owing to the hose being bent or owing to unduly high internal pressure or in consequence of a pull in longitudinal direction, the hose is stretched, after a certain interval of time the flange c of the lower part will contact with the step h, Fig. 6, and prevent further extension of the hose-that is, undue compression of the main packing a. This method of construction can be applied either to the form of hose illustrated in Fig. 3, with a single auxiliary packing g, orto the form shownin Fig. 4, with two (or, if desired, several) auxiliary packings. Such a hose as just described,with

' two auxiliary packings, is illustrated in Fig. 8.

Fig. 7 shows a further modification of my new metallic spiral hose. This construction differs from that shown in Figs. 5 and 6, inasmuch as instead of a step 7i in the upper fianged part the lower flanged part c of the hose is simply bent back toward the packing a, so that the part c partly embraces the latter. After what has already been said the purpose of this latter construction will be obvious. Thus if the hose becomes stretched through any cause the upper edge of the part c will contact with the overlapping fiange CZ after a certain time and stretching of the hose in the direction of its axis-that is, compression of the main packing d beyond a certain limit-is prevented.

Figs. 9 and l0 show still further modified forms of my hose adapted to confine the stretching oi' the hose between certain limits.

In the form shown in Fig. 9 the object in view is attained by a rigid or inelastic body t' being inserted in the channel which receives the main packing a, against which body/L' the anges c and (l must press immediately the hose is stretched to a certain definite length.

In the form shown in Fig. lO stretching of the hose is limited by the upper end of the lower liange c being turned over at right angles above the main packing a. The action of this arrangement is similar to that shown in Fig. 7, inasmuch as after the hose is stretched to a certain extent the rearwardlyturned-over end of the flange c will butt against the flange CZ.

I-Iaving thus fully described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

l. A metallic spiral hose, comprising a wound metallic strip of double-channel section provided with a lip, packing located between the overlapping channel of the one turn and the under channel of the adjacent turn, and auxiliary packing held by said lip, so as to prevent the main packing from being displaced, substantially as described.

2. A metallic spiral hose, comprising a wound metallic strip of double-channel section, said channels being provided with lips, packing located between the overlapping channel of the one turn and the under channel of the adjacent turn, and auxiliary packings held by said lips, so as to prevent the main packing from being displaced, substantially as described.

3. A metallic spiral hose, comprising a wound metallic strip of double-channel secL tion presenting means for holding auxiliary packing, the upper-channel flange being pro-Y vided with a step adapted to butt against the lower-channel flange on extension ofthe hose to a certain extent, packing located between the upper channel of the one turn and the under channel ofthe adjacent turn, and auxiliary packing material held by said means provided for the purpose, so as to prevent the main packing from being displaced, substantially as described.

4. A metallic spiral hose, comprising a wound metallic strip of double-channel section presenting means for holding auxiliary packing, packing located between the upper channel of the one turn and the under channel of the adjacent turn, auxiliary packing material held by said means provided for the purpose, so as to prevent the main packing from being displaced, and an inelastic body located similarly to the main packing in such manner that the flanges of upper and lower channels butt against it on extension of the hose beyond a certain amount, substantially as described.

5. A metallic spiral hose, comprising a wound metallic strip of double-channel section presenting means for holding 'auxiliary packing, packing located between the upper channel ot the one turn and the lower channel of the adjacent turn, the flange of said lower channel being so disposed as to butt against the flange of the upper channel on extension of the hose beyond a certain limit, and auxiliary packing material held by said means provided for the purpose, so as to prevent the main packing from being displaced, substantially as described.

Signed at Stuttgart, Germany, this 11th day of August, 1902.

EMIL VITZENMANN.

Witnesses:

ERNST ENTENMAR, A. ALTMEYER.

IOO

IIO 

